Base station apparatus and communication control method

1. A base station apparatus for performing time and frequency scheduling in uplink packet access, comprising:

an interference amount measurement part configured to measure an uplink interference amount for each interference amount measurement unit which comprises a predetermined number of unit time lengths in a time domain and a predetermined number of frequency blocks in a frequency domain, each frequency block included in the interference amount measurement unit being a unit in the frequency domain for performing the time and frequency scheduling;

an interference amount determination part configured to determine whether the uplink interference amount satisfies a predetermined condition; and

an overload indicator reporting part configured to report an overload indicator to a neighboring cell when the predetermined condition is satisfied.

2. The base station apparatus as claimed in claim 1 ,

wherein the interference amount determination part determines that the predetermined condition is satisfied when the interference amount measured for each interference amount measurement unit is equal to or greater than a predetermined reference value, and

the predetermined reference value is any one of a value set beforehand as a system parameter, a value set by a control signal sent from an upper apparatus, and a value autonomously controlled by the base station apparatus.

3. The base station apparatus as claimed in claim 1 ,

wherein the interference amount determination part determines that the predetermined condition is satisfied for the top predetermined reference number N of interference amount measurement units in the interference amount, from the largest interference amount, measured in each interference amount measurement unit, and

the predetermined reference number is any one of a value set beforehand as a system parameter, a value set by a control signal sent from an upper apparatus, and a value autonomously controlled by the base station apparatus.

4. The base station apparatus as claimed in claim 1 ,

wherein the interference amount determination part determines that the predetermined condition is satisfied for the top predetermined reference number N of interference amount measurement units in the interference amount from the largest interference amount, in which the interference amount measured in each of the interference amount measurement units is equal to or greater than a predetermined reference value, and

each of the predetermined value and the predetermined reference number is any one of a value set beforehand as a system parameter, a value set by a control signal sent from an upper apparatus, and a value autonomously controlled by the base station apparatus.

5. The base station apparatus as claimed in claim 1 ,

wherein the interference amount measurement unit is set by any one of a system parameter set beforehand, a control signal sent from an upper apparatus, and the base station apparatus.

6. The base station apparatus as claimed in claim 1 , comprising:

a transmission power control part configured to control transmission power of a subject interference station based on an overload indicator sent from a neighboring cell.

7. A communication control method in a base station apparatus for performing time and frequency scheduling in uplink packet access, comprising:

an interference amount measurement step of measuring an uplink interference amount for each interference amount measurement unit which comprises a predetermined number of unit time lengths in a time domain and a predetermined number of frequency blocks in a frequency domain, each frequency block included in the interference amount measurement unit being a unit in the frequency domain for performing the time and frequency scheduling;

an interference amount determination step of determining whether the uplink interference amount satisfies a predetermined condition; and

an overload indicator reporting step of reporting an overload indicator to a neighboring cell when the predetermined condition is satisfied.